Enforce shader input and output variables with a specified location to be single declarations.

src/compiler/ParseHelper.cpp

@@ -649,6 +649,17 @@ bool TParseContext::structQualifierErrorCheck(int line, const TPublicType& pType
     return false;
 }
 
+bool TParseContext::locationDeclaratorListCheck(int line, const TPublicType &pType)
+{
+    if (pType.layoutQualifier.location != -1)
+    {
+        error(line, "location must only be specified for a single input or output variable", "location");
+        return true;
+    }
+
+    return false;
+}
+
 bool TParseContext::parameterSamplerErrorCheck(int line, TQualifier qualifier, const TType& type)
 {
     if ((qualifier == EvqOut || qualifier == EvqInOut) && 
@@ -1322,6 +1333,9 @@ TIntermAggregate* TParseContext::parseDeclarator(TPublicType &publicType, TInter
     if (structQualifierErrorCheck(identifierLocation, publicType))
         recover();
 
+    if (locationDeclaratorListCheck(identifierLocation, publicType))
+        recover();
+
     if (nonInitConstErrorCheck(identifierLocation, identifier, publicType, false))
         recover();
 
@@ -1339,6 +1353,9 @@ TIntermAggregate* TParseContext::parseArrayDeclarator(TPublicType &publicType, T
     if (structQualifierErrorCheck(identifierLocation, publicType))
         recover();
 
+    if (locationDeclaratorListCheck(identifierLocation, publicType))
+        recover();
+
     if (nonInitConstErrorCheck(identifierLocation, identifier, publicType, true))
         recover();
 
@@ -1378,6 +1395,9 @@ TIntermAggregate* TParseContext::parseInitDeclarator(TPublicType &publicType, TI
     if (structQualifierErrorCheck(identifierLocation, publicType))
         recover();
 
+    if (locationDeclaratorListCheck(identifierLocation, publicType))
+        recover();
+
     TIntermNode* intermNode;
     if (!executeInitializer(identifierLocation, identifier, publicType, initializer, intermNode))
     {

src/compiler/ParseHelper.h

@@ -95,6 +95,7 @@ struct TParseContext {
     bool boolErrorCheck(int, const TPublicType&);
     bool samplerErrorCheck(int line, const TPublicType& pType, const char* reason);
     bool structQualifierErrorCheck(int line, const TPublicType& pType);
+    bool locationDeclaratorListCheck(int line, const TPublicType &pType);
     bool parameterSamplerErrorCheck(int line, TQualifier qualifier, const TType& type);
     bool nonInitConstErrorCheck(int line, const TString& identifier, TPublicType& type, bool array);
     bool nonInitErrorCheck(int line, const TString& identifier, const TPublicType& type, TVariable*& variable);